The first is the best thesis
Hello, Henry!
Roosevelt's speech shows that preoccupation in this sentence: "In times like these it is immature -- and, incidentally, untrue -- for anybody to brag that an unprepared America, single-handed and with one hand tied behind its back, can hold off the whole world."
Hugs!
If you are trying to pick a phrase at the end, I would go for either A. or D.
A
The mayors speech lasted an hour